304 stainless steel tubing, pipe, tube

304 stainless steel tubing/pipe/tube is the main product of Younglee Tube. Our factory manufacture 304 stainless steel tubing in a wide range of sizes.

1) What is 304 stainless steel tubing

Material 304 stainless steel (material grade 304 )is an austenitic stainless steel, it contains about8%–10.5% Nickel, about 18%–20% chromium, and maximum 0.08% Carbon, it is the most common stainless steel, also known as European standard 1.4301. 304 stainless steel tubing is popular for its excellent performance in high corrosion resistance, high strength, high temperature resistance, high pressure resistance and high workability, and its cost-effective.

2)  304 stainless steel tubes chemical composition & chemical properties

According to standard A 312/A 312M(Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes) & A269(Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service)

  • Featured chemical properties:
  • Maximum percentage of Carbon (C) is 0.08 %
  • Maximum percentage of Phosphorous (P) is 0.045 %
  • Maximum percentage of Sulphur (S) is 0.03 %
  • Minimum percentage of Chromium is 18 % and maximum is 20 %
  • Minimum percentage of Nickel is 8 % and maximum is 10.5 %, common is 8 %.

304 stainless steel chemical composition table:

304 stainless steel chemical composition-(304L)
3.Mechanical properties 
  • Tensile strength: standard A269 requires the breaking pressure should be Min. 485Mpa. Younglee will conduct 2 tensile tests, the breaking pressure is about 600Mpa.
  • Yield strength: standard A269 requires the breaking pressure should be Min. 170Mpa. Younglee will conduct 2 yield tests, the breaking pressure is about 290Mpa.
  • Elongation: Younglee’s tubes have excellent elongation performance, the required elongation according to A 269 is Min.35%, while the elongation of our factory’s tubes is around 63%
  • Hardness (HRB): standard A269 requires Hardness should be Max.90, Younglee will conduct 2 Hardness tests, the result is about 70.

Younglee’s tubes will also conduct Flattening test and Flaring test according to ASTM A1016/A1016M.All above mechanical properties will show in Younglee’s material test certification attached with tubes.

4.304 stainless steel tubes application

Seamless 304 stainless steel tubes is widely used for both structural and pressure applications, such as carrying liquids and gases in processing operations in the petrochemical, chemical, papermaking processing, marine industries, water treatment.

304 stainless steel tubes application for Heat Exchanger

304 stainless steel tubes application for Heat Exchanger 304L)



4.304 stainless steel tubes sizes & dimension

For Genaral use, Younglee supply tubes as below sizes & dimension.

  • Outside diameter range:6 mm to 406 mm
  • Wall Thickness range: 0.5mm – 20 mm
  • Length range:upto 18 meters
  • Younglee can supply tubes in metric & inch.

5.Difference between 304 and 304L stainless steel

304 VS 304L are very similar in chemical composition except for carbon content. The maximum carbon of content of 304 is 0.08%(standard A269), while the maximum carbon of content of 304L is 0.035%(standard A269). Obviously the “L” in 304L means extra-low carbon.a slight difference causes mechanical properties difference, 304L has lower tensile strength and yield strength.

However, 304 and 304L could be replaceable to each other in many situation, that is why people also use material grade 304/304L stainless steel tubing, and their price &cost is slightly difference, 304L SS tubes is about 100-200 usd/ton expensive than 304 SS tubes.

Grade 304L has, but noticeable, reduction in key mechanical performance characteristics compared to the “standard” grade 304 stainless steel alloy.


To know more about material 304 stainless steel, Wiki also has a detailed explain, click to read more: SAE_304_stainless_steel.  

Stainless Steel Precision Tubes & Pipes 

Stainless steel precision tube of Younglee is manufactured through cold drawn or cold rolling (cold pilgering ) process.  The features of our precision tubes are including high dimension accuracy, suitable hardness, strong mechanical properties, high pressure resistance and excellent corrosion resistance. And our precision tubes are suitable for welding, bending and fabrication of all kinds.

Popular manufacturing standards of seamless stainless precision tubes:

Precision tubes are mostly manufactured according to the same standards with ordinary stainless steel seamless tubes, however, the dimension tolerance of precision tubes is more precision and tighter.

Product Norms:

  • ASTM A 213, ASTM A 312, A 269, A632, A 511, etc.
  • EN 10216-5 TC1/TC2, EN 10297-2
  • PED 97/23/EC
  • NACE MR0175

Size tolerance usually according to

  • EN 10305-1,
  • EN ISO 1127 D4/T4
  • Customers’ requirements, our factory can make tolerance as precise as O.D +/- 0.05 mm; W.T +/- 0.05 mm depending on the sizes.

Materials available:

As one of the main stainless steel seamless tube manufacturer and supplier, Younglee Tube can provide precision tube in full range of Austenitic stainless steels as:

  • ASTM / AISI: 304/304L, 316 /316L, 321/321H, 316Ti, 347 / 347H,
  • EN/DIN: 1.4301/1.4307, 1.4401/1.4404/1.4435, 1.4541/1.4878, 1.4571,

And a broad range of duplex steels and super duplex stainless steel tubes as

  • ASTM / AISI: S31803, S32750,S32760, 2205, 904 / 904L
  • EN/DIN: 1.4462, 1.4410, 1.4539.

Our factory can provide Dual stainless steel tubing, such as 316/316L and 304/304L stainless tubing and others.

Younglee Tube manufactures precision tubes in below size range:

  • Tube outside diameter (O.D): 3 to 76 mm
  • Tube wall thickness (W.T): 0.5 – 10 mm
  • Length: Our precision tubes can be supplied with fixed lengths from 0.5 to 15 meters, or random lengths.

Heat treatment and delivery surface condition:

All seamless stainless steel precision tubes are solution annealed or bright annealed. Mostly we deliver the precision tubes in bright annealing surface as stainless steel bright annealed tubes, and polished surface or pickled surface. It depends on the tube outside diameter dimension and wall thickness and customer’s requirements.

We do below inspections and tests for our finished precision tubes before packing:

  • 100% NDT test (Non-destructive testing) such as Eddy Current or ultrasonic tests
  • 100% PMI test
  • Dimension inspection
  • Visual inspection
  • Spectral analysis
  • Tensile test
  • Flaring test and Flattening test
  • Intergranular corrosion test
  • Microstructure test

Our precision stainless steel seamless tubes are supplied with Mill Test Certificates. Our QC issue the MTCs according to EN 10204 / 3.1 or EN 10204 /3.2 on customer’s request. And the 3.1 MTC includes the reports of the inspections and tests above.

Packing and shipments:

In order to protect the seamless stainless precision tubes, we usually pack them in wooden cases, and each tube will be capped with a plastic cap on each end. We can arrange shipment to USA, Canada, Brazil, Colombia, UAE, South Africa, Vietnam, Australia, Korea, Singapore, Malaysia, Philippines,  Indonesia, Thailand and other countries on customers’ requests.

Stainless Steel Hydraulic Tubing

Stainless steel hydraulic tubes and hydraulic pipes are widely used in hydraulic systems or high pressure applications where corrosion resistant is required. Younglee Tube is one of the first class quality hydraulic tubing manufacturer and supplier in China. We supply hydraulic tubes and pipes in a full range of austenitic stainless steels and duplex stainless steels.

With more than 20 years experience in the hydraulics line industry, we’re well positioned to provide and counsel products according to your hydraulic requirements and applications.

stainless seamless hydraulic tubes and-pipes

Here below are the detailed specification of our stainless seamless hydraulic tubing.

Production and inspection standards

Our factory Younglee Tube produces stainless steel Hydraulic tubing according to various norms as below:

  • ASTM A 269, ASTM A213, ASTM A312; Corresponding ASME standards
  • EN 10216-5 TC1 / TC2; EN 10297-2
  • NACE MR0175/ISO 15156
  • PED 97/23/EC, AD 2000
  • Besides the above, we also produce and supply hydraulic pipes in GOST, JIS, China GB standards, or on customer’s requests.
  • Our factory supply all stainless seamless hydraulic tubes and pipes with Mill Test Certificate according to EN 10204 3.1 B or EN 10204 3.2 on customer’s request.

Materials available

Our factory manufactures and supply Hydraulic tubes and hydraulic pipe in various stainless steel grades, duplex steel, super duplex steel grades according to ASTM / ASME or EN / DIN standard.

  • ASTM / AISI steel grades: 304/304L, 321/321H, 316 /316L,  316Ti, 347 / 347H, S31803, S32750, S32760, 2205, 904 / 904L.
  • EN/DIN steel grades: 1.4301/1.4307, 1.4541/1.4878, 1.4401/1.4404/1.4435, 1.4571, 1.4462, 1.4410, 1.4539.
  • Equivalent GOST, JIS and GB standard steel grades.

Dual stainless steel tubing 316/316L and 304/304L would be the most popular grades for many different applications. These hydraulic tubing is mostly supplied in fixed length 6 meters (20 foot) in seamless production forms, or other required lengths.

Size Range and dimension tolerances

Outer Diameter: 4.71 mm to 76 mm;
Wall thickness: 0.5 mm – 15 mm
Tolerance: O.D. min. +/-0.03mm, WT min. +/-7.5%.
Length: Standard Lengths of hydraulic tube and pipe is 6 meters fixed length. Other lengths on request, our factory can manufacture hydraulic tubes with length up to 18 meters.

Delivery condition

Our factory manufactures and supplies stainless steel hydraulic tubing in below three delivery conditions:

  • Bright annealed condition; this is known as stainless steel bright annealed tubes. Our factory’s BA tube is available with O.D up to 50.8 mm.
  • Solution annealed and pickled condition.
  • Annealed + pickled and with outside polished finished.

Main Features
Our factory manufactures and supplies Hydraulic pipe / hydraulic tube with features like:

  • smooth surface, no cracks and other defects,
  • hardness below HRB80
  • high precision tolerances,

All of the above features can ensure preventing the risk of leakages when connecting hydraulic tubes with couplings.

Bright Annealed Tubes in Stainless steel and Duplex Steel

Bright annealed tubes in stainless steel grades and duplex steel grades are the main product line of Younglee Tubing, which is a high quality China precision stainless steel seamless tube manufacturer and supplier.

Detailed introduction of bright annealed tubes

Bright annealed stainless tubes are characterized by its inside and outside bright surfaces. Bright annealed tubes usually have stricter tolerances and are used in applications which requires high cleanness and high precision dimensions. To ensure the dimension accuracy, BA tubes are usually produced by cold rolling on high precision stainless steel tube cold rolling machines.

1) Product Description

The full name of our bright annealed tube is bright annealed stainless steel seamless tubes. But  some times also describe it as bright annealed stainless steel tubes or bright annealing tubes, or some times SS BA tubes for short.

2) Specification

Bright annealed stainless steel tubes are mostly produced according to American standards ASTM A213, ASTM A269, ASTM A270, ASTM A 632;

Or according to European /ISO standard EN10216-5, EN 10297-2

3) Typical Sizes


Imperial:1/4”, 3/8”, 1/2”, 5/8”, 3/4”, 1” ,1-1/4”,1-1/2”;

Metric: 6,8 10, 12,16,18,20,25,32,38;

Or made to orders.

4) Material grade

304/304L; 316/316L,321, S31803, S32205


5) Features 

Bright and smooth surfaces

High precision tolerances

Excellent internal surface roughness

Cold rolled tubes internal surface Ra < 0.5 or better

Cold drawn tubes internal surface Ra < 0.3 or better

6) Applications






Hydraulic and mechanical systems